Combined expansion and contraction joint-semihexagonal type



Dec. 4, 1928.

A. C. FISCHER COMBINED EXPANSION CONTRACTION JOINT SEMIHEXAGONAL TYPE Original File'q Jan. 5. 1922 Patented Dec. 4, 1928.

ALBERT C. FISCHER, OF-CHICAGO, ILLINOIS.

PATENT OFFICE.

COMBINED EXPANSION AND CONTRACTION JOINTSEMIHEXAGONAL TYPE.

Original application filed January 3, 1922, Serial No. 526,742. Patent No. 1,655,835, dated January 10, 1928. Divided and this application filed May 9, 1927. Serial No. 190,083.

This application is a division of my application Serial No. 526,742, filed January 3,

1922 for expansion contraction joint, said application having matured into Patent No. 1,655,835 on January 10, 1928. 1

Heretofore in concrete pavements where contraction was to be provided for it has been the practice to insert a piece of metal longitudinally or transversely below the surface, so that when the concrete block or slab is poured and completed the contraction joint is not visible at the surface. After the concrete sets and contracts the function of these pieces of metal is to cause a very fine crevice to develop thru the entire slab, so that it becomes visible on thesurt'acc, and functioning in this way it is styled a contraction joint.

Furtherdevelopments in this style of allowing for expansion and contraction in con crete pavements can be made in which an angular or tongue and groove formation is provided, so that the projections thus developing in one concrete slab, by reason of filling in these projections in the contract on joint, penetrate the other slab so that resistance is caused-to any liftingaction on the part of the concrete slabs Some of these formations have been angular and some half hexagonal in shape, with straight flanges extending on eitherside in a vertical position when the joint is installed. These contraction joints,-while causing the crevice to develop along a straight line across the concrete slab or in the surface above which the joint is inserted, do not prevent the ingress of water, street acids or the like, which would tend to hastily corrode the metal contraction joint, and alsoenter the subsoil underneath .0 the slab, keeping the subsoil in aconstantly wet or damp condition.

My invention provides for an improved joint which has many advantages over the heretofore practiced methods, and also provides for the waterproofing of the joint automatically. These advantages are realized by insertion of a bituminous slab of varying thickness, depending upon the requirements.

- The contraction. joint flanges are imbedded in the bituminous slab on either side of the projecting center. This not only tends to preserve the metal flanges but also has a tendency to protect the projecting partof the joint, because in expanding in warm weather some of this bituminous material will ooze along thesurface of the uncovered metal.

It may be readily understood, of course, that a metal contraction joint may be coated with paint or bituminous material in addition to the projecting slabs of bituminous material acting both as expansion and contraction joints.

Expansion joints have usually been placed so that the upper edge of the joint was visible on the surface of the pavement, and in many cases was allowed to project above the surface, so that the traific would form a sort of mushroom top over the crevice.

It can be readily understood that the purpose of this invention is to totally submerge both the contraction and expansion parts of this joint beneath the surface, so that when the concreteis finished and poured it will not be visible on the surface but willaccomplish the same function, in causing a crevice to form across the surface, due to contraction. It will further function by waterproofing this crevice from within, and upon expansion of the bituminous material, and also the pavement, it will cause the aspha'ltic substance to work its way up to the crevice,

so that after a hot period the bituminous material may often work its Way to the surface, while the base part will have a tendency to prevent moisture from coming up, filling the crevice from below, and in this manner the entire crevice will be kept waterproof, and

at the same time perform both the functions oint. 1

In the accompanying drawing, which illustrates the preferred form of the invention of an expansion joint and a contraction herein referred to, Figure 1 is a detailed per spective view of a preformed strip of expansion joint material, which is applied to the grooved portion of the contraction joint illustrated in Figure 2; and

Figure 2 is a perspective view of a portion of such a contraction joint with the strip applied thereto as stated.

Referring now to the drawing in detail. A represents a preformed strip of bituminous expansion joint which is adapted to be applied to the-contraction joint B, shown in Figure 2. The joint B is made with a hexagonal tongue and groove intermediate portion C, with flat portions or flanges D and F arranged to one side thereof. a

strip, especially when it is considered that.

way the strip A may be fitted in the groove.

Ordinarily no special means are needed to secure the strip A in place, andsince it is made of bituminous material it is more or less adhesive and will adhere to the metal the shape-of the groove will enable the strip to be more or less tightly wedged in place.-

The strip A, which containsbituminous material, will not only insulate the grooved.

side of the joint B to an extent that any water seeping into the crevice will not trickle below the tongue and groove portion and will block this seepage, but also, under heat and pressurethis bituminous material will flatten out and will flow and spread itself outwardly and along the flat flange-like portions 1), thus waterproofing the crevice 01:; 'crack. The

flow, however, will not be suflicient to cause the bituminous'material to ooze out on the top of the crevice. This flattened action of .the bituminous material A is substantially a result of the-wed ge-shaped natureof the pocket formed in the contraction joint or plate B and are outwardly inclined sides C and C which merge into the flat plate-like ,flanges D and E. In addition to this func- ,tion the strip A also acts as a cushion against which the projection formed in the concrete on the ooved side of the joint will abut.

I claim: r i 1. A contraction joint-having a semi-he):-

i agonal center with flanges extending therefrom, the center face of which is covered with an expansion joint strip and adapted to cooperate, therewith.

2. A metallic contraction joint having oppositely extending plate-like flanges'and an intermediate portion formed as a' wedgeshaped depression, and bitumen containing material adherently disposed in said depression.

' a A combined contraction and expansion joint comprising, sheet material having op positely extending flanges and an intermei'iaI mounted in said pocket.

' of May, 1927.

diate connecting portion having angular dis posed sides forming a depress on, and bitumen containing material adherently mounted on one of thewalls of the depression. Y i.

4. A combined contraction and expansion joint comprising a single iece of metal'bent to form lateral extending anges and an offset wedge-shaped pocket, and wedge-shaped slab of bituminous material adherently mounted to the basal wall of the pocket.

joint comprising a single piecexof flexible sheet metal having plate-like flanges disposed l in subst ntiall y a common plane and having an intermediate connecting portion of wed shaped'formationdisposed to one side on t e plane of the flanges, and bitumen containing material adherently mounted in said offset 6. An expansion contraction joint compris-- ing a metal strip having a' tongue on one side, a correspondin groove on the other side,

and a flat'portion arranged to one side of said tongue and groove, and a thickness of waterproofing material insaid groove, said tongue and groove having outwardly flaring of the class described, I

walls. a

7. In a paving joint upper and lower slab se aratir'g portions, and an intermediatewe ge-shapedftongue and groove portion connecting the same, and

compressible material appliedv to thetong'ueand groove portion -and carried by the tongue i and groove portion.

8. A device of he class described, compris-. ing, a sheet of metal bent to provide opposed flanges and an intermediate pocket .on one side of the sheet, and bitumen containing inaterialcarried in said pocket.

9. Acombined contraction and expansion joint comprising a preformed sheet of'metal bent to provide lateral flanges and a pocket formed with an inclined Wallflhd-E reformed strip of compressible waterproo ng mate- -10. A combined contraction and expansion joint comprisinga sheet of metalbent to form upper and lowerflanges and a laterally bent portion forming a depression on one side and 4 a projection on the other side of said sheet, and a preformed'st-rip of=waterproofing material adherently mounted in said depression.

Signed zit-Chicago, Illinois, this 3rd day ALBERT Q-FISQHER.

65' 5. Acoinbined contraction and expansion 

